There are two most popular folk songs in Belarus. This is one of them in the performance of the ensemble "Radzimichi." All belarusians know this song!!!
And another thing: the video you saw an interesting stringed musical instrument, it is called cymbals. It is played with special hammers, wrapped with a soft felt cloth. I know how to play the cymbals, it's not very difficult.
This song is a couple of years ago caused a standing ovation in Japan, where the ensemble "Radzimichi" went on tour.